Weighing scale



FIG. 1 is a perspective view of top, front and left side of a weighing scale showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front view thereof; and,

FIG. 5 is a left side view thereof, the right side being identical thereto. 

The ornamental design for a weighing scale, as shown and described. 